Complex mechanical products, such as automobiles and airplanes, must stisfy many customer requirements, commonly called Key Characteristics (KCs). Such products have many separate parts, all of which must cooperate to deliver these requirements. In many cases there are more requirements than degrees of freedom available to meet them all independently, requiring prioritization. This problem is called KC conflict. In a highly compex product, such conflicts can be difficult to detect during design. This paper defines this problem and shows how screw theory can be used to detect and potentially correct it.
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